Asa is correct, timezone settings must be right for everything else to work correctly. We already have documented some problems regarding this, so in the future, please try to search for existing posts from the issues so we don’t get doubles 
What operating system and browser (+ version) are you using @Jay? I haven’t been able to reproduce the problem myself and obviously this seems to work others as well as we have several events per day working ok. But there’s definitely an issue here so we need to just find it!